/*
Copyright 2016 OpenMarket Ltd
Copyright 2018, 2019 New Vector Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import EditableItemList from "../elements/EditableItemList";
import React, {createRef} from 'react';
import PropTypes from 'prop-types';
import {MatrixClientPeg} from "../../../MatrixClientPeg";
import * as sdk from "../../../index";
import { _t } from '../../../languageHandler';
import Field from "../elements/Field";
import ErrorDialog from "../dialogs/ErrorDialog";
import AccessibleButton from "../elements/AccessibleButton";
import Modal from "../../../Modal";

class EditableAliasesList extends EditableItemList {
    constructor(props) {
        super(props);

        this._aliasField = createRef();
    }

    _onAliasAdded = async () => {
        await this._aliasField.current.validate({ allowEmpty: false });

        if (this._aliasField.current.isValid) {
            if (this.props.onItemAdded) this.props.onItemAdded(this.props.newItem);
            return;
        }

        this._aliasField.current.focus();
        this._aliasField.current.validate({ allowEmpty: false, focused: true });
    };

    _renderNewItemField() {
        const RoomAliasField = sdk.getComponent('views.elements.RoomAliasField');
        const onChange = (alias) => this._onNewItemChanged({target: {value: alias}});
        return (
            <form
                onSubmit={this._onAliasAdded}
                autoComplete="off"
                noValidate={true}
                className="mx_EditableItemList_newItem"
            >
                <RoomAliasField
                    id={`mx_EditableItemList_new_${this.props.id}`}
                    ref={this._aliasField}
                    onChange={onChange}
                    value={this.props.newItem || ""}
                    domain={this.props.domain} />
                <AccessibleButton onClick={this._onAliasAdded} kind="primary">
                    { _t("Add") }
                </AccessibleButton>
            </form>
        );
    }
}

export default class AliasSettings extends React.Component {
    static propTypes = {
        roomId: PropTypes.string.isRequired,
        canSetCanonicalAlias: PropTypes.bool.isRequired,
        canSetAliases: PropTypes.bool.isRequired,
        canonicalAliasEvent: PropTypes.object, // MatrixEvent
    };

    static defaultProps = {
        canSetAliases: false,
        canSetCanonicalAlias: false,
        aliasEvents: [],
    };

    constructor(props) {
        super(props);

        const state = {
            altAliases: [], // [ #alias:domain.tld, ... ]
            localAliases: [], // [ #alias:my-hs.tld, ... ]
            canonicalAlias: null, // #canonical:domain.tld
            updatingCanonicalAlias: false,
            localAliasesLoading: false,
        };

        if (props.canonicalAliasEvent) {
            const content = props.canonicalAliasEvent.getContent();
            const altAliases = content.alt_aliases;
            if (Array.isArray(altAliases)) {
                state.altAliases = altAliases.slice();
            }
            state.canonicalAlias = content.alias;
        }

        this.state = state;
    }

    componentDidMount() {
        return this.loadLocalAliases();
    }

    async loadLocalAliases() {
        this.setState({ localAliasesLoading: true });
        try {
            const cli = MatrixClientPeg.get();
            let localAliases = [];
            if (await cli.doesServerSupportUnstableFeature("org.matrix.msc2432")) {
                const response = await cli.unstableGetLocalAliases(this.props.roomId);
                if (Array.isArray(response.aliases)) {
                    localAliases = response.aliases;
                }
            }
            this.setState({ localAliases });
        } finally {
            this.setState({ localAliasesLoading: false });
        }
    }

    changeCanonicalAlias(alias) {
        if (!this.props.canSetCanonicalAlias) return;

        const oldAlias = this.state.canonicalAlias;
        this.setState({
            canonicalAlias: alias,
            updatingCanonicalAlias: true,
        });

        const eventContent = {
            alt_aliases: this.state.altAliases,
        };

        if (alias) eventContent["alias"] = alias;

        MatrixClientPeg.get().sendStateEvent(this.props.roomId, "m.room.canonical_alias",
            eventContent, "").catch((err) => {
            console.error(err);
            Modal.createTrackedDialog('Error updating main address', '', ErrorDialog, {
                title: _t("Error updating main address"),
                description: _t(
                    "There was an error updating the room's main address. It may not be allowed by the server " +
                    "or a temporary failure occurred.",
                ),
            });
            this.setState({canonicalAlias: oldAlias});
        }).finally(() => {
            this.setState({updatingCanonicalAlias: false});
        });
    }

    onNewAliasChanged = (value) => {
        this.setState({newAlias: value});
    };

    onLocalAliasAdded = (alias) => {
        if (!alias || alias.length === 0) return; // ignore attempts to create blank aliases

        const localDomain = MatrixClientPeg.get().getDomain();
        if (!alias.includes(':')) alias += ':' + localDomain;

        MatrixClientPeg.get().createAlias(alias, this.props.roomId).then(() => {
            this.setState({
                localAliases: this.state.localAliases.concat(alias),
                newAlias: null,
            });
            if (!this.state.canonicalAlias) {
                this.changeCanonicalAlias(alias);
            }
        }).catch((err) => {
            console.error(err);
            Modal.createTrackedDialog('Error creating alias', '', ErrorDialog, {
                title: _t("Error creating alias"),
                description: _t(
                    "There was an error creating that alias. It may not be allowed by the server " +
                    "or a temporary failure occurred.",
                ),
            });
        });
    };

    onLocalAliasDeleted = (index) => {
        const alias = this.state.localAliases[index];
        // TODO: In future, we should probably be making sure that the alias actually belongs
        // to this room. See https://github.com/vector-im/riot-web/issues/7353
        MatrixClientPeg.get().deleteAlias(alias).then(() => {
            const localAliases = this.state.localAliases.slice();
            localAliases.splice(index);
            this.setState({localAliases});

            if (this.state.canonicalAlias === alias) {
                this.changeCanonicalAlias(null);
            }
        }).catch((err) => {
            console.error(err);
            Modal.createTrackedDialog('Error removing alias', '', ErrorDialog, {
                title: _t("Error removing alias"),
                description: _t(
                    "There was an error removing that alias. It may no longer exist or a temporary " +
                    "error occurred.",
                ),
            });
        });
    };

    onCanonicalAliasChange = (event) => {
        this.changeCanonicalAlias(event.target.value);
    };

    _getAliases() {
        return this.state.altAliases.concat(this._getLocalNonAltAliases());
    }

    _getLocalNonAltAliases() {
        const {altAliases} = this.state;
        return this.state.localAliases.filter(alias => !altAliases.includes(alias));
    }

    render() {
        const localDomain = MatrixClientPeg.get().getDomain();

        let found = false;
        const canonicalValue = this.state.canonicalAlias || "";
        const canonicalAliasSection = (
            <Field onChange={this.onCanonicalAliasChange} value={canonicalValue}
                   disabled={this.state.updatingCanonicalAlias || !this.props.canSetCanonicalAlias}
                   element='select' id='canonicalAlias' label={_t('Main address')}>
                <option value="" key="unset">{ _t('not specified') }</option>
                {
                    this._getAliases().map((alias, i) => {
                        if (alias === this.state.canonicalAlias) found = true;
                        return (
                            <option value={alias} key={i}>
                                { alias }
                            </option>
                        );
                    })
                }
                {
                    found || !this.state.canonicalAlias ? '' :
                    <option value={ this.state.canonicalAlias } key='arbitrary'>
                        { this.state.canonicalAlias }
                    </option>
                }
            </Field>
        );

        let localAliasesList;
        if (this.state.localAliasesLoading) {
            const Spinner = sdk.getComponent("elements.Spinner");
            localAliasesList = <Spinner />;
        } else {
            localAliasesList = (<EditableAliasesList
                id="roomAliases"
                className={"mx_RoomSettings_localAliases"}
                items={this.state.localAliases}
                newItem={this.state.newAlias}
                onNewItemChanged={this.onNewAliasChanged}
                canRemove={this.props.canSetAliases}
                canEdit={this.props.canSetAliases}
                onItemAdded={this.onLocalAliasAdded}
                onItemRemoved={this.onLocalAliasDeleted}
                noItemsLabel={_t('This room has no local addresses')}
                placeholder={_t(
                    'New address (e.g. #foo:%(localDomain)s)', {localDomain: localDomain},
                )}
                domain={localDomain}
            />);
        }

        return (
            <div className='mx_AliasSettings'>
                {canonicalAliasSection}
                {localAliasesList}
            </div>
        );
    }
}